James w



(No Model.)

` J. W. MLOY. n GENTBRING DEVICEV PoR STQNB'I'UUTTINGMACHINES. 1 No. 329,325.

Patent-ed 061;. 27, 1885.

wllli w 1N. PETERS, now-mmm. wnmgm, u. c.

UNiTED STATES (PATENT Ormea.

JAMES W. MALOY, OF BOSTON, MASS.,

ASSIGNOB, BY MESNE ASSIGNMENTS,

TO THE AMERICAN MARBLE CUTTING COMPANY, OF SAME PLACE.

CENTERING DEVICE FOR STONE-CUTTING- MACHINES.

SPECIFICATION fol-ming partei" nemers Patent No. 329,325, dated ocroberz'r, `lees.

Application filed December 15, 1884. Serial No. 150,417. (No model.)

To all whom it may concern:

Beit known that I, JAMES W. MALOY, a citizen ofthe United States,and a resident of Boston, (Somerville,) in the county of Middlesex' My invention relates to devices whereby plates, marble slabs, and other objects having openingsl therein may be centered upon the base-plates or face-plates of stone-cutting or other finishing machines; and my invention consists of a centering device adapted to be fixed to the supporting-plate, and provided with arms capable of simultaneous adjustment, 4and having bearing edges, which may be brought against the edges of the openings, as fully set forth hereinafter, and as illustrated 2o in the accompanying drawings, in which* Figure l is a sectional elevation showing the centering device as applied to centering a marble slab. Fig. 2 is a plan of the device shown in Fig; l. Fig. 3 is a sectional view 2 5 illustrating a modification.

A is the frame or base of the device, which may be of any suitable construction, and B is a standard extending vertically from the base and turning freely upon a central rod or bolt,

3o c, and provided with three or more radiating arms, b, extending parallel to the baseplate a short distance above the latter. To the outer end of each arm b is pivoted the inner end of abar or slide, C, each of which has a longi- 3 5 tudinal slot, av, and through the latter passes a guiding pin or stud, d, extending from the base-plate. From the upper end of the standard Bextend laterally arms I I, which may be cast with and form part of the standard, but

4o are preferably made as illustrated in the drawings, each arm consisting of a handle, f, and screw-rod c, extending through a threaded boss, g, upon the standard, so that the inner end of the screw-rod may be brought to bear 4 5 against the stationary bolt c to secure the parts in position after adjustment.

The above-described parts are so propor-L tioned and the guiding-studs d are so arranged in respect to the central bolt, c, that Whatever may be the position to which the bars or slides 5o C are thrown by turning the standard B the outer or bearing end, i, of each slide will always be the same distance from the center of the bolt c as the ends of the other slides.

In using the abovedescribed device the end of the boltc is inserted in an opening upon i the bed-plate of the boring-machine, planer,

lathe, or other device upon which any object is to be centered, and the said object Iis then placed in such position that the device, or the @o standard B thereof, shall extend through an opening therein,the center of which opening is to be brought to coincide with that of the opening in the bed-plate. The standard B is then turned by means of the arms I, so as to throw outward the bars or slides C and bring them against the edges of the said opening in the object to be centered, and the latter is ad justed until the ends of all the slides bear upon the said edges, when the opening in the 7o object will be central with that in the bedplate. The parts may now be fixed in posiA tion by turning the handles f until the ends of the screw-rods e are jammed against the fixed bolts a. To prevent the base-plate A 7'5 from turning when the standard is revolved, it is provided with a pin, j, adapted to engage with a bearing or opening in the bed-plate. Instead of this pin, a screw or other clamping device may be employed.

In those cases where the opening in the object to be centered is not large enough to rcceive all the parts of the device described the article may be centered by providing each bar or slide C with the lip s, having an inner bearing-shoulder, w, which may be brought to bear upon the outer periphery of the object. This arrangement is specially adapted for use in centering pulleys and gearwheels, the shoulders w being brought against the peripha go eries thereof by drawing in the slides, and where the opening in the hub is very small the standard B should be made Without the bosses g, and the screwhandles f are withdrawn prior to passing the standard ,through the hub, and afterward inserted.

The device, as illustrated, is specially intended for use in centering marble slabs ine tended for the tops of wash-stands, &c., upon the base-plates of the stone-cutting machines used in finishing the surfaces of the slabs and the 4edges of the openings, the application of the device being illustrated in Fig. l, in which M represents the baseeplate of the cutter-machine, having a central opening, o, for the reception of the end of the bolt a, and a second opening, u, for the reception of the stud j; and N represents the marble slab, the opening z in which incloses the base-plate of the centering device, the bars or slides C of which are brought against the edge of the opening, as shown.

Although the bars or slides C are shown as being connected directly to the arms b, they may be guided so as to slide radially upon the baseplate A, and may be connected to the arms b by links, and the standard B, instead of turning upon a fixed bolt, a, may be provided with a projection at the lower end eX- Y tending to and turning in an opening in the justment.

bed-plate a, Where clamping-handles are elnployed for securing the standard after its adrIhey may be constructed in various different ways so as to clamp the stand ard to the central bolt.

One modification is shown in Fig. 3, in which the stem of each handle is hung to a pin, 3, extending through a slot in the standard, and is provided with a cam-like end, which is jammed against the bolt a when the handle is turned downward.

Without limiting myself t'o the precise arrangement and construction ofthe parts shown, I claim- Y l. The combination, with the base-plate A, provided with guide-studs d, of a standard pivoted centrally on said plate and provided with radial arms, and slides jointed to said arms and swinging and sliding on said studs, substantially as described.

2. The combination, with the base-plate A, provided with guide-studs d, of a standard pivoted centrally on said plate and provided with radial arms,and slides jointed to said arms, swinging and sliding on said studs, and a clamping'arm or arms carried by the standard and adapted to engage with the pivot thereof to secure the standard in position after adjustment, substantially as described.

3. The combination ofthe base-plates, slides, standard connected with the slides, central bolt, a, and arms consisting of handles provided with screw-rods turning in the standard and adapted to be brought against the central bolt, as described.

In testimony whereof I have signed my name to thisspecication in the presence of two subscribing witnesses.4

Witnesses:

GEORGE R. EAGER, OHAs. M. TILLINGHAs'r.

It is hereby lcertiied that Letters Patent No. 329,325, granted October 27, 1885, upon the application of James W. Maloy, of Boston, Massachusetts, for an improvement in Centering Devices for Stone-Cutting l'iachinesf7 was erroneously issued to The American Marble Cutting Company; that said Letters Patent shouk have been issued to The American Marble Cutting Company of Maine, 'its prncipalptace of business being in Boston, Massachusetts that this correction has been made in the records of the oase in the Patent Ofce, and that the seid Letters Patent should be read to conform thereto. l

Signed, countersigned, and sealed this 3d dey of August, A. D. 1886.

[SEAL] H. L. MULDROW, A.

Acting Secretary of the Interior. Gountersigned R. B. VANGE,

Acting Commissioner of Patents. 

